The intro bassline (and basically throughout the song) is:
B A G#m G B A G#m E
G --------------------------------------------------------------|D -------------------------5-4----------------------------2-0---|A -2----2-0----0---------------5--2----2-0----0---------------4-|E ----2------0---4------3------------2------0---4--4p2p0--------|
Sometimes the bass changes a bit, but that is the basic bassline.
the lyrics are (and the same eight chord progression is constant throughout
the entire song):
B A G#m G
B A G#m E